fix(backend): 移除多余的 String 构造函数调用

cfc-backend/src/main/java/com/etotem/cfc/service/ReportFingerprintService.java

@@ -102,7 +102,7 @@ public class ReportFingerprintService {
             pb.redirectErrorStream(true);
             Process process = pb.start();
 
-            String output = new String(readStream(process.getInputStream()), StandardCharsets.UTF_8);
+            String output = readStream(process.getInputStream());
             int exitCode = process.waitFor();
 
             if (exitCode == 0 && !output.trim().isEmpty()) {
@@ -156,7 +156,7 @@ public class ReportFingerprintService {
             pb.redirectErrorStream(true);
             Process process = pb.start();
 
-            String output = new String(readStream(process.getInputStream()), StandardCharsets.UTF_8);
+            String output = readStream(process.getInputStream());
             int exitCode = process.waitFor();
 
             if (exitCode == 0 && !output.trim().isEmpty()) {